The trouble with depression is that

• The very pain & disorder is in your reasoning, happiness, and "will to live" mechanisms - in your heart, in your soul.
• The entire experience of self and life continuum is affected.
• There is no space in your head & heart for objectivity.
• It's as though the pain is you.
• Lost in and disabled by the pain, often we are not able to objectively seek the proper treatment as we would for our injured leg, or to persevere when a treatment fails to help.